Shears.



G. S. SHAW & J. M. SPELLMAN.

SHEABS Arrmouron TILED APR. 9, 190a.

Patented Mar 16,1909,

W1 TNESSES [NVE/VTOR6 am A 8 5 l 8M 3w 5 cm, wlasnmareu. 17 c CHARLES S. SHAW AND JAMES M. SPELLMANQOFSALMON, IDAHO.

, snnnns.

are. 915,491.

Specification of Letters Patent. v

Patented March 16, 1909.

Application filed. April 9, 1908. Serial No. 426,090.

To all whom it may concern:

Be it known that we, orIAaLns S. SHAW and JAMES M. SPELLMAN, citizens of the United States, residing at Salmon, in the county of Lemhi, State of Idaho, have invented certain new and useful Improvements in Shears; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to scissors or shears, and has for one of its objects to improve the construction and increase the power or force of the cutting blades, while decreasing the power required to operate them.

Another object of the invention is to provide an implement of this character wherein the tension may be readily increased or decreased as required and to take up the wear incidental to the coaction of the blades, and

to maintain them in proper operative rela' tion.

With these and other objects in view, the invention consists in certain novel features of construction as hereafter shown and described, and in the drawings illustrative of the preferred embodiment of the invention, Figure l is a side view. Fig. 2 is anedge view of the improved implement, and Fig. 3 is a section on the line 33 of Fig. 1. Fig. 4 is a detail sectional view of a screw pivot.

The improved implement comprises two shear members 1011 having lateral shoulders 1213 at their inner or butt ends and with-arms 1l15 extending from the shoulders. The inner faces 27 of the shoulders are inclined to the longitudinal plane of the shear members and the portions 28 of the shear members opposite to the shoulders are correspondingly inclined but reversely thereto, so that when the shear members are superimposed, the inclined faces of the shear members will bear against the inclined faces of the shoulders, as shown.

Projecting from the shoulders 1213 are lugs 16-17, integral with the shoulders and bearing over the adjacent portions of the superimposed shear members, with a pivot pin 18 extending through both shear members and likewise through the lugs. The lugs are bendable relative to the shoulders from which they extend, so that when means are employed to shorten or lengthen the pivot pin, either by upsetting when the pivot element isin the form of a rivet, or adjusting the screws when the latter are employed, as may be preferred, the lugs will yield to the pressure and thus enable the requisite tension to be applied, to maintain the shear members in proper operative relations. The adjustment of the pivot pin also provides an effectual means for takingup wear when it occurs, as will be obvious. In Fig. 3 is shown means for arranging the pivot ele ment 18, capable of accomplishing the desired result. In the smaller sizes of scissors, the pivot will generally be in the form of a screw as shown in Fig. 3, while for the larger sizes of shears the double screw arrangement as shown in Fig. 4 will preferably be employed.

The construction shown in Fig. a comprises a pin 18 similar to the pin 18 and extending through the members 1()-11. in the same manner, the pin 18 extending through the washers 17-16 and provided with threaded apertures in the ends to receive clamp screws 2930 whereby the washers are secured to the pin and the members 1011 clamped between the washers.

Pivoted at 19*20 respectively to the arms 14-15 are finger levers -2l22 having the finger loops 23-24 of the usual form at their free ends, the lever 21 having a longitudinal slot 25 through which the lever 22 extends, and the two levers pivotallyunited by a pivot pin 26. I

Bythis arrangement it will be obvious that a material increase inthe force of the shearing members is obtained without increasing the power required to operate the finger levers, or the same shearing force may be obtained as in shears of ordinary construction by applying less power to the finger levers, and it will also be obvious that by applying an increased power to the finger levers, a very material increased force will be applied to the shearing members.

An im )lement thus constructed may be employe with greater ease to the operator and with consequent loss fatigue. 7 I

The improvement is equally applicable to allsizes and forms of scissors and shears, and will greatly improve implements of this character.

Vl hat is'claimed is 1. In an implement of the class described, two superimposed shearmembers having lat eral shoulders at their inner ends and with arms projecting from said shoulders, levers for ordinary purposes, therefore,

eral shoulders at their inner ends, bendable I lugsfextending from said shoulders and bear ing' over said shear members, a ivot pin ex- 15 tending through said shear mem ers and likewise through said lugs, and finger levers operatively connected to said shear members.

In testimony whereof, we afiiX our signatures, in presence of two witnesses.

CHARLES S. SHAXV. JAlViES M. SPELLMAN.

Witnesses:

P. J. DEMPsEY, A. J. QUARLEs. 

